A．They are self-evident. B．They are yet to be proved. C-找考题网

单项选择题

A．They are self-evident.
B．They are yet to be proved.
C．They are to be further studied.
D．They are supported by scientific evidence.

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单项选择题

A．Three years.
B．Four years.
C．Five years.
D．Six years.

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